ISSN:
1573-8264
Keywords:
active oxygen species
;
ascorbate peroxidase
;
ascorbic acid
;
catalase
;
hydrogen peroxide
;
oxidative injury
;
oxidative stress
;
superoxide dismutase
;
Triticum aestivum
Source:
Springer Online Journal Archives 1860-2000
Topics:
Biology
Notes:
Abstract The role of plant antioxidant systems in stress tolerance was studied in leaves of three contrasting wheat genotypes. Drought imposed at two different stages after anthesis resulted in an increase in H2O2 accumulation and lipid peroxidation and decrease in ascorbic acid content. Antioxidant enzymes like superoxide dismutase, ascorbate peroxidase and catalase significantly increased under water stress. Drought tolerant genotype C 306 which had highest ascorbate peroxidase and catalase activity and ascorbic acid content also showed lowest H2O2 accumulation and lipid peroxidation (malondialdehyde content) under water stress in comparison to susceptible genotype HD 2329 which showed lowest antioxidant enzyme activity and ascorbic acid content and highest H2O2 content and lipid peroxidation. HD 2285 which is tolerant to high temperature during grain filling period showed intermediate behaviour. Superoxide dismutase activity, however, did not show significant differences among the genotypes under irrigated as well as water stress condition. It seems that H2O2 scavenging systems as represented by ascorbate peroxidase and catalase are more important in imparting tolerance against drought induced oxidative stress than superoxide dismutase alone.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1023/A:1001898310321
